I don't even know if i'm using the proper terms to describe all of this, but I'm trying to use an API to make a very basic test app. That is where some of the weird words in my examples come from.
Anyway, this is what I have, and the console log returns each animal in a big list:
function listAnimals(){
animals.fetch(function(){
while(animals.hasNextEntity()) {
animal = animals.getNextEntity();
var type = animal.get('animal');
var name = animal.get('name');
var gender = animal.get('gender');
var output = 'type: '+type+', name: '+name+', gender: '+gender;
console.log(output);
}
});//fetch
}//listAnimals
However, I need to be able to access the "output" variable outside of that while loop. Placing console.log out of the while loop only returns 1 single animal:
function listAnimals(){
animals.fetch(function(){
while(animals.hasNextEntity()) {
animal = animals.getNextEntity();
var type = animal.get('animal');
var name = animal.get('name');
var gender = animal.get('gender');
var output = 'type: '+type+', name: '+name+', gender: '+gender;
}
console.log(output);
});//fetch
}//listAnimals
How do I get all "output" results outside of the while loop, and not just 1? Do I need to put it in an array first or something? How do I do that?
Yep, an array would work fine. Try something like:
function listAnimals(){
var arr = [];
animals.fetch(function(){
while(animals.hasNextEntity()) {
animal = animals.getNextEntity();
var type = animal.get('animal');
var name = animal.get('name');
var gender = animal.get('gender');
var output = 'type: '+type+', name: '+name+', gender: '+gender;
arr.push(output);
}
});//fetch
console.log(arr); // This should print out all of your outputs.
}//listAnimals
Related
I was trying to access sub-properties from a javascript file and it's giving me something weird!
Suppose this is my JS file named data.js
module.exports = {
something: {
name: "Something",
num: 1,
email: "something#gmail.com"
},
somethingtwo: {
name: "Something Something",
num: 2,
email: "somethingtwo#gmail.com"
},
};
In my main js file named app.js, where I need to access it, it looks like
var persons = require('./data.js');
var getAName = function() {
for(var name in persons) {
console.log(name.email);
}
}
I really don't know what goes wrong but I have been trying this for quite a long time now. The expected output is the email Ids from the data.js file but instead, i get undefined times the number of entries (if there are 2 entries in data.js, then I get 2 undefine and so on).
How can I access the email or the num from the data.js without those undefines?
console.log(name) is returning something somethingtwo
Well, name.email is undefined because name is a string.
You can test that by writing
console.log(typeof name);
Now, to solve your problem, you need to access the property correctly:
var getAName = function() {
for (var name in persons) {
console.log(persons[name].email)
}
}
Returns:
something#gmail.com
somethingtwo#gmail.com
for(var name in persons) {
//persons is actually an object not array
//you are actually iterating through keys of an object
//var name represent a key in that object
console.log(persons[name]); //value corresponding to the key
}
I guess this code will give you the desired result.
You should be using console.log(persons[name].email)
require don't automatically calls the module
var DataArchive = require('./data.js');
var module = DataArchive.module;
var persons = module.exports;
var getAName = function() {
for(var person in persons) {
//person should be something (first iteration) and somethingtwo (second iteration)
console.log(person.email);
}
I am working on a chrome plugin that fetches data. But now i have been running into a problem, I have been asked to put together a nested array with all the data I have retrieved but I have no clue on how to pull this off.
What i want to create:
var messagedata [{
time: messageTime,
Date: messageDate,
Text: messageText
{
time: messageTime,
Date: messageDate,
Text: messageText
}
}];
Note that I know how to create the above when I have the variables. That is not the problem. But in this case i do not know how to declare the variables for each message from the array that is generated.
What i need is a nested array for each message that is in the HTML. So the above example displays 2 arrays but it could be 54 for example.
Code i use to generate normal array:
adiv.innerHTML = cleanupDocString;
trs = adiv.querySelectorAll('tr[bgcolor="#FFFFFF"]');
trs.forEach(function(tr) {
var d = [];
tr.querySelectorAll("td")
.forEach(function(td) {
var img = td.querySelector("img"),
src = img && img.attributes.getNamedItem("src").value;
d.push(src || td.textContent);
});
msgs.push(d);
});
The code above puts this out in console (this example has 2 messages inside it, there are also arrays with 54 messages):
0:Array(6)
0:"2017-08-31T00:00:00"
1:"13:22"
2:"MessageType"
3:”ClientName"
4:"Subject "
5:"messageText"
length:6
proto:Array(0)
1:Array(6)
0:"2017-08-31T00:00:00"
1:"13:21"
2:" MessageType "
3: "ClientName"
4:" Subject "
5:" messageText "
lenth:6
proto:Array(0)
To make the question easier:
I need to know how i can put the data into a variable that i fetch from the array above. I just don't know how to do it so its dynamic.
What i tried:
var messageDate = msgs[0][0];
var messageTime = msgs[0][1];
var messageType = msgs[0][2];
var messageClient = msgs[0][3];
var messageSubject = msgs[0][4];
var messageText = msgs[0][5];
The above code works but only fetches the first message. I need all the messages that are on the page that is provided. I tried using a ID in the first [] but that also didn't give me the desired result.
Thanks for your help and patience in advance.
Output and code has been slightly edited so it hides personal information
i am assuming msgs is arrray of arrays and the order of properties is guaranteed
var mappedArray = msgs.map((msg)=> {
return {
messageDate : msg[0];
messageTime : msg[1];
messageType : msg[2];
messageClient : msg[3];
messageSubject : msg[4];
messageText :msg[5];
}
})
Edit1
you can use arrayconcat
var mergedArray = mappedArray.concat(otherArray);
To transform the multidimensional array to an array of objects with the help of Array.prototype.map and a simple helper dictionary which defines the index => property mapping.
var messages = [
[
"2017-08-31T00:00:00",
"13:22",
"MessageType",
"ClientName",
"Subject",
"messageText",
"unwanted value"
],
[
"2017-08-31T00:00:00",
"13:22",
"MessageType",
"ClientName",
"Subject",
"messageText",
"unwanted value"
],
[
"2017-08-31T00:00:00",
"13:22",
"MessageType",
"ClientName",
"Subject",
"messageText",
"unwanted value"
]
];
var mappingDef = {
0: 'messageDate',
1: 'messageTime',
2: 'messageType',
3: 'messageClient',
4: 'messageSubject',
5: 'messageText'
};
function transformMessages(messages, mappingDef) {
return messages.map(function(message) {
var obj = {};
for(var index in mappingDef) {
if(mappingDef.hasOwnProperty(index)) {
obj[mappingDef[index]] = message[index];
}
}
return obj;
});
}
console.log(transformMessages(messages, mappingDef));
Hi there before I start I did try looking through the search about writing variables so if this has been asked and answered then I do apologise but this is baffling me ....
So here goes ..
example of what I am talking about
var i = e[ab]
var n = e[cd][ef]
var t = e[cd][gh]
I know that when I want var i I can put e.ab but how would I go about writing var n and var t
So assuming your object looks like this (based on your description, it sounds like you want to access an object which is the property of another object), and you want to access them through the indexer properties (which would be a property of a property).
var e = {
ab : "variableOne",
cd : {ef:"ef object"},
gh : {ij:"ij object"},
}
var i = e["ab"]
//if these are properties, then you need to add quotes around them
//to access a property through the indexer, you need a string.
var n = e["cd"]["ef"]
var t = e["gh"]["ij"]
console.log(i);
console.log(n);
console.log(t);
console.log("this does the same thing:")
console.log(e.ab);
console.log(e.cd.ef);
console.log(e.gh.if);
In your example the object would look like
//e is the parameter, but I show it as a variable to show
// it's relation to the object in this example.
e = {
now_playing: {artist:"Bob Seger"; track:"Turn the Page"}}
}
this is different than an array of arrays:
var arr = [
['foo','charlie'],
['yip', 'steve'],
['what', 'bob', 'jane'],
];
console.log(arr[0][0]); //foo
console.log(arr[0][1]); //charlie
console.log(arr[1][0]); //yip
console.log(arr[1][1]); //steve
console.log(arr[2][2]); //jane
https://jsfiddle.net/joo9wfxt/2/
EDIT:
Based on the JSON provided, it looks like parameter e in the function is assigned the value of the item in the array. With your code:
this line will display: "Rock you like a hurricane - Nontas Tzivenis"
$(".song_title .current_show span").html(e.title);
and this line will display: "Rascal Flatts - Life is a Highway".
$(".song_title .current_song span").html(e.np);
If it's not displaying you might want to double check your JQuery selectors. This ".song_title .current_song span" is selecting it by the classes on the element.
I think you are in need of a bit of a refresher on basic JavaScript syntax. Here's how you can assign an "empty object" to a variable, then start to assign values to it's properties:
e = {}
e.ab = {}
e.cd = {}
e.cd.ef = "data"
or you can use the associative array syntax for property access:
e = {}
e["ab"] = {}
e["cd"] = {}
e["cd"]["ef"] = "data"
You see the latter is using the object e like a two-deep associative array. Is that what you are looking to do?
JavaScript is not strongly typed. So an Array "a" could contain objects of different types inside.
var a = [ "a value", [1, 2, 3], function(){ return 5 + 2;}];
var result = a[0]; //get the first item in my array: "a value"
var resultOfIndexedProperty = a[1][0]; //Get the first item of the second item: 1
var resultOfFunc = a[2](); //store the result of the function that is the third item of my array: 7
Hope this helps a little.
I have two data structures (they are much longer, these are just excerpts)
var data = [
{count: 6, zip: "78705"},
{count: 4, zip: "78754"},
{count: 33, zip: "78757"}
]
var txcodes = [
{county: "SWISHER", code: "437"},
{county: "TARRANT", code: "439"},
{county: "TAYLOR", code: "441"},
{county: "TRAVIS", code: "453"}
]
I have written code that successfully goes through “data” and takes the zipcode and retrieves the corresponding county (from an external website via HTTP request). It returns a structure that looks like
results = {
TRAVIS: 8,
TAYLOR: 1
}
(8 and 1 are examples of counters for how many times a zipcode from data occurs…basically a running count).
What I need to do next is use the keys from results to look up what the corresponding code in txcodes is. How do I do this?
var currentCounty = str.result[0].County
returns the county from results.
console.log(txcodes[i].county + " " + txcodes[i].code)
prints the county & code from txcodes.
I’m a little confused on how to do this. It seems like a relatively simple concept but I can’t seem to get the desired result. Can someone please point me in the right direction?
If county names are unique and if you are going to be making repeated lookups, you should build a "map" of the codes out of the array:
var txcodesByCounty = txcodes.reduce(function(p, c) {
p[c.county] = c.code;
return p;
}, {});
You can then look up codes directly from this map.
Build a lookup map like this :
var lookupMap = {};
for (var i = 0; i < txcodes.length; i++) {
var element = txcodes[i];
lookupMap[element.county] = element;
}
Then you can simply do this to print the desired output :
console.log(lookupMap[currentCounty].county + " " + lookupMap[currentCounty].code);
If the county in your result is only available as a key, you'll need to for..in, Object.keys or Object.getOwnPropertyNames to access them.
After, access the details via a map as others have suggested
var county, found = [];
for (county in results)
found.push(map[county]);
So what you get back from your HTTP request is a simple object, and you need to access its property names. You can do that easily with Object.keys:
resultKeys = Object.keys(result);
This will give you an array of the object properties:
[ "TRAVIS", "TAYLOR" ]
You can easily iterate over this array now, and inside you ask your result object for its value:
for (var i = 0; i < resultKeys.length; i++) {
console.log(resultkeys[i] + ": " + result[resultkeys[i]]);
}
Using this technique, you can use for example underscore.js libary to easily filter for your desired data:
for (var i = 0; i < resultKeys.length; i++) {
console.log(_.filter(txcodes , function(key){ return txcodes.county== resultkeys[i]; }));
}
I need to pass an array as parameter but i have a problem, i dont know how to explain it so here is the example:
I have this code:
var doc = document;
var Class = {};
Class.Validate = function(opc)
{
alert(opc.id);//
return Class;// when returns the object the alert trigger as expected showing "#name"
};
Class.Validate({
id: "#name",
})
But what im trying to do is this:
var Class = {};
Class.Validate = function(opc)
{
alert(opc.name);//when the object is return show display "carlosmaria"
return Class;//
};
Class.Validar({
name: {field:"carlos",field:"maria"},
})
how can i archived that?
alert(opc.name) should return something like {Object object} because it's an objet. The second point is that your object has twice "field" as property.
If you want to use an array, you should call this way:
Class.Validar({
name: ["carlos", "maria"]
})
Then, you could loop over opc.name to concatenate a full name. Something like this:
Class.Validate = function(opc)
{
var name = "";
for (var i=0, len=opc.name.length; i<len; ++i) {
name += opc.name[i];
}
alert(name);//when the object is return show display "carlosmaria"
return Class;//
};
Consider using actual arrays (via array literals):
Class.Validate({
name: ["carlos", "maria"]
});